On 3/13/2016 9:01 PM, Richard (Rick) Karlquist wrote:
A good alternative to schedule 40 pipe is the tubing used nowadays for
fence top rails, known as SS40. It's lighter (thinner wall) but stronger
and actually less expensive than galvanized sch. 40 pipe if purchased
from the right place.
We routinely use it on cell sites for antenna masts in place of sch. 40.
Here are the specs:
http://www.hooverfence.com/catalog/chart.htm
-Steve K8LX
Note that the outer diameter of fence tubing will always
be the same as the outer diameter of some standard water
pipe size. E.G. Both "1 7/8 inch" fence tubing
and "1 1/2 inch" water pipe (any schedule) actually
have an outer diameter of 1.900 inch. Either can be
shimmed with standard 2" OD aluminum irrigation pipe with
0.050 inch wall to fit standard 2.000" mast clamps
or bearings.
I don't know why they make fence tubing and pipes the
same size. One theory is that you if you want to build
a fence on steroids, water pipe can be substituted for
fence tubing very easily. (Attention: Donald Trump :-)
Or maybe they make both of them on the same equipment.
(Obviously, I have spent way too much time loitering
in hardware stores.)
Hehe.
But I'm not sure why substituting schedule 40 for SS40 in fence
applications or any other (except plumbing perhaps) would be an
*upgrade*. A quick search didn't yield specs for sch. 40 that would lend
itself to an applicable comparison, but the fence people claim that SS40
is *stronger* than sch. 40.
In the fence business there are numerous tee couplers, etc. already
sized for stand sch 40 OD's, which probably drove the size constraints
for SS40.
-Steve K8LX
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